sharp

1. Origins, structure, and basic meaning

• Structure: The on reading is えい, and the kun reading is するどい. It has 15 strokes. It appears in words for sharpness and acute angles.
• Basic usage: 鋭い is read するどい, and 鋭角 is read えいかく.

2. Common pitfalls and similar expressions

• 鋭い / 鋭角
  • 鋭い means sharp or keen and is read するどい. It describes a blade or question as sharp or keen.
  • この包丁は刃が鋭いので扱いに注意して。 means “This kitchen knife has a sharp blade, so handle it carefully.”
  • 鋭角 means acute angle and is read えいかく. It refers to an acute angle.
  • 三角定規を使って鋭角を描いた。 means “I drew an acute angle using a set square.”